Story 5.7 — Admin Provider Registry

[BSick7]

Story 5.7 — Admin Provider Registry

Register all Azure platforms in nullstone/admin/all/providers.go.

Story Points: 2 pts | Estimated: 5h | Epic: Epic 5 — nullstone CLI — Azure Admin Platform

Task	Hours
Add ACA contract: {Category:"app", Subcategory:"container", Provider:"azure", Platform:"aca", Subplatform:"*"}	1h
Add AKS contract: {..., Platform:"k8s", Subplatform:"aks"} with NewRemoter	0.5h
Add VM contract: {..., Subcategory:"server", Platform:"vm", Subplatform:"*"} with NewRemoter	0.5h
Add App Service contract with NewRemoter	0.5h
Add Functions contract with NewRemoter (stub)	0.5h
Registry lookup tests	2h